*{
  margin: 0;
  padding: 0;
}
ul,ol,li{
  list-style: none;
}

a,a:active,a:hover,a:link{
  text-decoration: none;
  color: #333;
}

input,button,select,textarea{
  outline: none;
}

img{
  width: 100%;
  height: 100%;
  display: block;
}

/*头部内容样式*/
.header{
  width: 1200px;
  height: 60px;
  background-color: skyblue;
  margin: 0 auto;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 30px;
  font-weight:700;
  color: #fff;
}

.header > p{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: 30px;
  font-size: 20px;
  display: none;
}

.header>p.active{
  display: block;
}